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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Balances	$ 126,280	$ 111,200	$ 119,194	$ 101,813
Balances	134,392	113,796	134,392	113,796
Accumulated Other Comprehensive Income (Loss)
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Balances	(12,444)	(9,555)	(10,531)	(8,518)
Unrealized loss on cash flow hedges	(100)	(88)	(1,660)	(713)
Amounts reclassified from AOCI	170	(17)	313	(90)
Foreign currency translation gain (loss)	3,433	(2,369)	2,937	(2,708)
Balances	(8,941)	(12,029)	(8,941)	(12,029)
Defined Benefit Plan Liability
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Balances	(1,628)	(1,006)	(1,628)	(1,006)
Balances	(1,628)	(1,006)	(1,628)	(1,006)
Cash Flow Hedges
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Balances	(2,228)	(341)	(363)	566
Unrealized loss on cash flow hedges	(133)	(108)	(2,184)	(914)
Amounts reclassified from AOCI	224	(27)	410	(128)
Balances	(2,137)	(476)	(2,137)	(476)
Tax effect of Cash Flow Hedges
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Balances	534	77	86	(132)
Unrealized loss on cash flow hedges, Tax effect	33	20	524	201
Amounts reclassified from AOCI, Tax effect	(54)	10	(97)	38
Balances	513	107	513	107
Foreign Currency Translation Adjustment
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Balances	(9,122)	(8,285)	(8,626)	(7,946)
Foreign currency translation gain (loss)	3,433	(2,369)	2,937	(2,708)
Balances	$ (5,689)	$ (10,654)	$ (5,689)	$ (10,654)

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Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount, after reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount before tax of reclassification adjustments of other comprehensive income (loss).

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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